Cutter for chair-arm braces.



l W. KRAEDEMANN.

GUTTER PoR CHAIR ARM BRAGES.

PPLICATIGN FILED MAR.30,1908.

Patented Nov. 17, 1908.

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APPLICATIN FILED MAR. 3 903,990. o 1908 Patented Nov. 17, 1908. 2 SHEETS-SHEET 2.

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UNITED STATES PATENT OFFICE.

WILLIAM KRAEDEIWIANN, OF SHEBOYGAN, WISCONSIN.

CUTTER FOR CHAIR-ARM BRACES.

To all whom it may concern.'

Be it known that I, IILLIAM KRAEDEMANN, a citizen of the United States, residing at Sheboygan, in the county of Sheboygan and State of lVisconsin, have invented a new and useful Cutter for Chair-Arm Braces, of which the following is a specification.

This invention relates to wood working machines, and more especially to that type of wood working machine arranged to form the ends of chair arm braces.

One object of the invention is to provide a simple machine of the kind described, arranged to form the end of a chair arm brace of various types and of various taper.

Another object of the invention is to provide a machine of the kind described in which it will be possible to adjust the arm for varying degrees of curvature.

IVith these and other objects in view, the invention consists in certain novel arrangements in detail, combination of parts, and specific forms of construction described in the specification, illustrated in the accompanying drawings, and set forth specifically in the claims.

In the accompanying drawings, like parts are indicated by similar characters of reference throughout the several views.

Figure 1 is a perspective view of the device as applied to a bench. Fig. 2 is a longitudinal sectional view therethrough. Fig. 3 is a transverse sectional view therethrough.

Similar numerals of reference are employed to indicate corresponding part's throughout the several figures of the drawings.

The body 10 is provided with a longitudinal recess in the bottom thereof. At the front of the recess 11 is held a plate 12 which extends across the bottom of said recess up the front of the machine, and back into a rabbeted portion 13. This plate is held to t-he body portion by screws or other suitable means, as indicated at 14.

In the rabbeted portion 13 above the plate is held a cutting block 15'. The plate is provided at its angled part with a slot 16 hereinafter described.

In the body 10 below the rabbeted portion 13 is formed a recess 17 and a slot 18 is formed in the plate opposite said recess. In this recess below the rabbeted portion is held an angle plate 19 normally pressed to the upper end of the recess by means of Specification of Letters Patent.

Application filed March 30, 1908.

Patented Nov. 1'7, 1908.

Serial No. 424,131.

lar 28. The plate 24 is provided with an angled portion 29 having an internally screw-threaded opening therein arranged to receive the screw 26. It will be observed that by means of this arrangement the angle plates 24 and 21 may be adjusted relative to each other.

In the rear of the device at the top of the body portion 10 is formed a recess 30 which is covered by a plate 31 having a slot 32 cut therethrough. A plate 33 is held at the rear end of the device and is provided with an opening 34 therethrough at the upper end thereof. A screw 35 passes through this opening, and rotates therein, being prevented from longitudinal movement by the collar 36. At the rear end of the screw 35 is mounted an operating crank 37. Upon the plate 31 is slidably mounted a plate 3S having rearwardly extending arms 39, which are joined by a cross bar 40 provided with .an internally threaded opening to receive lthe screw 35. The plate 38 is further provided with a threaded opening 41. The plate 38 is made in the form of a yoke having arms 42 to embrace the sides of the body portion 10, and its arms are provided with slots 43 therein. The yoke 44 is held above this plate, the arms whereof extend downward into the slots 43 and this yoke is arranged to move longitudinally therein.

A screw 45 passes through this yoke and into the threaded opening 41 in the plate 38. Upon the lower end of this yoke are pivotally mounted arms 46 provided with upwardly extending portions 47. The upwardly bent portions 47 are rigidly attached to a yoke 43 spaced therefrom at the lower attachment by the distance blocks 49. The upper attachments forms a pivotal support wherein'there is mounted a knife lever 50 comprising av pair of arms 51 and a handle 52. Adjustably attached to the arms 51 is a U shaped knife holder 53, by means of 4slots '54 formed in the arms 51 and a bolt extending Atherethrough and into the U a spring 20. On the front of the plate is frame carrying the knife.

In this angle plate is another angle Mounted on the U-frame is a forming knife 56, being held therein by any preferred means, as by the bolt 57. The yoke 48 is provided with slots 5S therein, through which extends a bar 59 having a cam GO thereon. Fixed to the outer end of the bar 59 are levers 61. On the floor within easy reach of the operators foot is a tre'adle or similar device connected to the levers 61 by any suitable'means, as by the loop and rod 62. It is not deemed necessary here to show this treadle, as the same forms no essential part of the device. In the yoke 48 is held a U-frame G3 arranged to receive the ends of the bar 59, and having a thumb nut (34, so

arranged that the distance between the U frame and the end of the yoke may be regulated, as desired. Oppositely disposed slots 65 extend through the side walls of the recess 11 and a bar 66 passes through the arms 42 and the slots 65, being arranged for l0ngitudinal movement therein. Upon one end of this bar is mounted a ratchet 67 arranged to co-act with a pawl GS. The bar is further provided with a square or like device for rotating the same, as indicated at 69. A U plate 7() is mounted on this bar to lie within the recess 11, and a roller 71 is held inthe end of said U plate. A spring 7-2 lies between the sides of said U plate. Y

Upon the bar 66 is mounted a roller 73 and a spring 72 is connected 4therewith by means of a suitable strap 74. The other end of the spring 72 is connected to a strap which passes over the roller 71 andv down through the slot 16, and is attached to the cam 50. It is obvious that the purpose of the'square end of the bar and the ratchet and pawl is to properly tension the spring 72as may be required.

In the operation ofthe device, a chair arm brace is placed beneath the knife, the end being forced firmly against the adjustable stop. The trea'dl'e is then depressed with the foot, which causes the arm G1 to rotate, thus actuating the cam 60 and pulling the knife firmly down upon the chair arm brace. The handle 52 is then depressed. The stop plate being properly adjusted, the arms 51 of the knife lever '50 will strike the lugs 25 just previously to the edge of the knife blade arl riving at the knife edge 22 of the stop plate.

The stop plate will then be depressed by means of the arms 52 and the knife 4willl be allowed to operate without at any time coming into contact with the upper end of said stop plate.

In continuing the operation, the foot is removed from the treadle andthe cam is rotated to the position shown in Fig'. 2 by means of the spring 72V. The spring at the same time keeps the 'cam and the parts attached thereto firmly against the body portion of the underside o the device. At the same time that this occurs, the spring 20 forces the stop plate 21 back to its original position. The chair arm may then be removed f'r'om beneath the knife, and the operation repeated as desired. To adjust the knife above the body portion for varying thicknesses of chair arm braces, it is only necessary to rotate the screw 64. By this mea-ns the knife may be raised or lowered to any required degree.

lVhen it is desired to make a cut of long radius on a chair arm brace the parts are adjusted as follows. The screws 55, are loosened and moved near the bottom of the slot 54. This of course raises the U frame higher with the knife blade. In order to properly position the knife blade for the desired thickness of chair arm brace, the same is again lowered by means of the screw 45. Additional adjustment may be given by the screw G4, to eEect this purpose. The fulcrum being at a distance from the knife blade, the cut will be rendered one of long radius. If now it is desired to start the cut well back on the chair arm brace, the adjustment is obtained by means of 'the screw 35, which moves the knife to or from the butt end of the machine. By means of this screw the proper' length of the curved portion of the brace can be readily secured. Further adjustment of the beginning 0f the cut may be made by proper manipulation of the screws 45 and 64. If it be desired to begin the cut abruptly the knife is tilted by means Y of the screw 45, and the adjustment to or from the base regulated by the screw 64. If, again, it be desired to begin the curve tangent with the curve of the chair arm brace the screw 45 is so manipulated that the knife will lie parallel to the base, and the screw G4, moved to bring the same down smoothly on the chair arm brace when in position for cutting. 1

that is claimed is 1. In a device of the character described, a base, a .yoke plate sli'dably mounted longitudinally of said base, a pair of arms attached to said yoke plate, a lever fulcrumed on said arms, a knife a'djustably mounted on said lever, a handle on said lever', and an 'adjustable stop.

2. In a device of the character described, a base, a yoke plate mounted for longitudinal movement on said base, a second yoke carried by said yoke plate and vertically adjustable thereon, arms attached to said second yoke, a knife lever pivotally -mounted 'on said arms, a knife adjustably mounted on said lever, a handle on said lever to actuyate the same, and an adjustable stop.

a base, a yoke plate loosely embracing the forward portion of said base, a lever connected to said yoke plate, a knife adjustably mounted on said lever, pedal operated means to position said knife, an adjustable, yielding stop held on the end of said base.

5. In a device of the character described, a base, a yoke plate loosely embracing the forward portion of said base, means arranged to hold said yoke plate upon said base, a lever pivotally mounted on said yoke plate, a knife adjustably mounted on said lever, and pedal operated means to position said knife.

6. In a device of the character described, a base, a yoke plate loosely embracing the forward portion of said base, means arranged to hold said yoke plate upon said base, a level` pivotally mounted on said yoke plate, a knife adjustably mounted on said lever, pedal operated means to position said knife, and an adjustable, yielding stop held on the end of said base.

7. In a device of the character described, a base, a yoke plate loosely embracing the forward portion of said base, a spring arranged to retain said yoke plate on said base, a lever pivotally mounted on said yoke plate, a knife adjustably mounted on said lever, and pedal operated means to position said knife.

8. In a device of the character described, a base, a yoke plate loosely embracing the forward portion of said base, a spring arranged to retain said yoke plate on said base, a lever pivotally mounted on said yoke plate, a knife adjustably mounted on said lever, pedal operated means to position said knife, and an adjustable, yielding stop held on the end of said base.

9. In a device of the character described, a base, a yoke plate loosely embracing the forward portion of said base, a spring arranged to hold said yoke plate in position on said base, a lever pivotally mounted on said yoke plate, a knife plate adjustably attached to said lever, means supported on said yoke plate arranged to move said knife towards said base, and means actuated by said spring normally holding said knife away from said base.

10. In a device of the character described, a base, a yoke plate loosely embracing the forward portion of said base, a spring arranged to hold said yoke plate in position on said base, a lever pivotally mounted on said yoke plate, a knife blade adjustably attached to said lever, means supported on said yoke plate arranged to move said knife towards said base, means actuated by said spring normally holding said knife away from said base, and an adjustable stop.

1l. In a device of the character described, a base, a yoke plate loosely mounted at the forward portion of said base, a lever pivotally connected to said yoke plate, a knife adjustably mounted on said lever, a cam held in said yoke arranged to move said knife to or from said base by the rotation of the cam, and a spring attached to said cam normally holding said knife awa-y from said base.

12. In a device of the character described, a base, a yoke plate loosely mounted at the forward portion of said base, a lever pivotally connected to said yoke plate, a knife adjustably mounted on said lever, a cam adjustable in said yoke carried thereby and arranged to move said knife, to or from said base by the rotation of the cam, and a spring attached to said cam normally holding said knife away from said base.

13. In a device of the character described, a base, a yoke plate loosely embracing the forward portion of said base, a lever pivotally mounted at the upper end of said yoke plate, a knife adjustably mounted on said lever, a U-shaped plate held within said yoke plate, means for adjusting the U-shaped plate longitudinally of said yoke, a cam supported in said U shaped plate, a spring attached to said cam normally holding said knife away from said base, and means to rotate the cam and draw the knife toward the base.

14. In a device of the character described, a base, a yoke plate loosely embracing the forward portion of said base, a lever pivotally mounted at the upper end of said yoke plate, a knife adjustably mounted on said lever, a U-shaped plate held within said yoke plate, means for adjusting the U shaped plate longitudinally of said yoke, a cam supported in said U shaped plate, a spring attached to said cam normally holding said knife away from said base, means to rotate the cam and draw the knife toward the base, and elements` arranged to adjust said yoke longitudinally of said base.

15. In a device of the character described, a base, a yoke plate loosely embracing the forward portion of said base, a lever pivotally mounted at the upper end of said yoke plate, a knife adjustably mounted on said lever, a U-shaped plate held within said yoke plate, means for adjusting the U-shaped plate longitudinally of said yoke, a cam supported in said U shaped plate, a spring attached to said cam normally holding said knife away from said base, a second yoke mounted for longitudinal movement on said base toward the rear thereof, arms attached to said first mentioned yoke pivotally mounted on said second yoke, and means for adj usting said yoke longitudinally of said base.

16. In a device of the character described, a yoke plate loosely embracing the forward 'portion thereof, a lever pivotally mounted at the upper end of said yoke plate, a knife adjustably mounted in said lever, a spring arranged to normally hold said knife away from said'loase, a cam arranged to draw said knife toward said base against the action oi'saidspring, a slotted yoke slidaloly mounted= tow-ard the rear of said base arranged for longitudinal movement thereof, means for movingsaid slotted yoke longitudinally of thebase, a third yoke arranged for vertical movement in. the slots of said second yoke, means for adjusting the relative positions ofsaid slotted yoke andthe third yoke, arms l eosgeeo" rigidly attached to the first mentioned yoke, and a pivotal connection between the third yoke and said arms.

In testimony that I claim the foregoing 15 as my own, I have hereto affixed my signature inthe presence of tWoWitnesses.

VILLIAM KRAEDEMANN. t

W'itnesses:

JOI-IN HAMELAN, RUDOLF SCHULZ. 

